Here & Now's Scott Tong describes ransomware as "a high-tech version of kidnapping." It's when a computer or tech system is hacked and money is demanded in order to get it back. In their new book, The Ransomware Hunting Team, ProPublica journalists Renee Dudley and Daniel Golden chronicle how ransomware has grown from individual attacks to large-scale operations against major corporations, universities and hospitals. But as they vividly explain to Tong, there's also a band of coding vigilantes who are helping ransomware victims regain access ... without paying up.